Ishinomimi (stone flea) - Ishinomimi (English spelling) bristletails

Japanese: イシノミ(石蚤) - イシノミ（英語表記）bristletails

A general term for insects belonging to the order Coryphia, suborder Microcoryphia. It is named after its habit of jumping on rocks. It is one of the primitive insects, and retains basal plates, which are part of the legs, on the abdominal segments. Body length is 5 to 20 mm. It is similar in shape to the Japanese book pest Coryphia, but its body is not flat. Its body color is gray-brown with black and white markings, but these colors come from the scales that grow on the surface of its body. The structure of its mouth, antennae, etc. is similar to that of winged insects, but its abdomen has abdominal spines and gastric vesicles found in myriapods. It lives on rocks in mountains and coasts, on shady tree trunks, under fallen leaves, etc., and feeds mainly on terrestrial algae.

Source: Heibonsha World Encyclopedia, 2nd Edition Information

Japanese:

シミ目イシノミ亜目Microcoryphiaに属する昆虫の総称。岩石上にいて跳ねる習性のためこの名がある。原始的昆虫の一つで，腹節に脚の一部である基節板を残す。体長5～20mm。和書の害虫のシミと形が似るが，体は扁平でない。体色は灰褐色で，黒や白の斑紋をもつが，これらの色は体表に生えている鱗片による。口，触角などの構造は有翅昆虫に近いが，腹部には多足類にある腹刺と腹胞をもつ。山や海岸の岩，日陰の樹幹，落葉下などにすみ，陸生藻類を主食とする。

出典　株式会社平凡社世界大百科事典第２版について　情報

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